Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff7a6b47fcd2b9e…

MALICIOUS

PDF

99.6 KB Created: 2021-06-30 10:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f72e4c326727bec9ee4c1d05e78e552 SHA-1: 43db6180c375fe62341361fd159dc809edf9ee04 SHA-256: fff7a6b47fcd2b9e0ec832403bb074a10a050382a9bdd425871e77a4238b0d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bertrandetgastineaudesigners.com/userfiles/file/26610012219.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608159954d315---26896039224.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5a8a89d0a94a95a1567333cd85da9d5d/pojomimapegux.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/89f86447b83729f80f3f8463a12d19ff/mirewaxapafojulenafolazug.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qm93db308e5jaqknqts8i7ivk1/10159266464.pdf
    • http://www.cafeinca.com/img/public/contenido/file/sazamulujoguresegiwa.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f18b83ea88b1797125d291737b001ba1/95660645166.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeadd75c9b---werotawidewepevo.pdf
    • https://systematix.pl/userfiles/file/22721857900.pdf
    • http://ctkupavna.ru/upload/file/tofoninebanatalaji.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/silufixames.pdf
    • https://asiabiru.com/contents//files/dudebusozowotevejuwudez.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b29af2da0---xoxuvejapogamapun.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8f07f5d104025effd911702ebce17d7/52885691558.pdf
    • http://allmedicus.com/userfiles/file/sawosi.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8323a12c---86270698615.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608010ee2b492---duxeba.pdf
    • http://ankurgroups.com/userfiles/file/31837408435.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed7cda259d---92801165487.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ecf5de7875e1414853e5e384c6ba9395/78473730230.pdf
    • https://melz-feu.ru/upload/84441823505.pdf
    • http://email-database.info/userfiles/file/zokanesuvefedirezemafezi.pdf
    • https://amrapalispot.com/userfiles/file/namuvidabibamagoxafekofa.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e1d666c853624f5fbb8bad2b20d1b72b/xesolajugijakegedolelesir.pdf
    • http://maristaslardero.es/userfiles/file/80693018605.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lump+on+outside+of+vagina
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001259e.bin
7ef8f3b5bff23d7e8bbdeed1a6c5b505540b4eafdf880744871998463e36603c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16544 bytes
font_01_sfnt_off00015067.bin
ff289aca313090f6f0d3ef9b0ca6eae0e1cab727ad7ca78ecfc3ffec2e415a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x15067 10816 bytes
font_02_sfnt_off00016933.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16933 16792 bytes